Also known as an exercise ECG, an exercise tolerance test (ETT) or a stress test. This is an ECG that is undertaken whilst you are exercising, usually on a treadmill or a stationary bicycle. This test is to see what happens to your heart when you are more active. When you are more active, your heart and muscles require more oxygen to keep up the demand. An ETT can help show how effective this is happening and if there is the presence of any coronary artery disease or how severe it may be.

This test is progressive and starts off at an easy rate and is made harder as the time goes on, either by increasing the speed or slope on the treadmill or increasing the tension on the stationary bike, thus making the heart work harder. Your ECG will be monitored at regular intervals and you will be asked about any symptoms you are experiencing. The test usually lasts from a few minutes up to 15 minutes.